作业帮求下列各三角函数值1、sin750° 2、cos 22π/3 3、tan(-7π/4) 4、sin900°
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求下列各三角函数值1、sin750° 2、cos 22π/3 3、tan(-7π/4) 4、sin900°
求下列各三角函数值
1、sin750° 2、cos 22π/3 3、tan(-7π/4) 4、sin900°
求下列各三角函数值1、sin750° 2、cos 22π/3 3、tan(-7π/4) 4、sin900°
1、sin750° =sin（720°+30°）=sin30° =0.5
2、cos 22π/3=cos（ 6π+4π/3）=cos4π/3=-0.5
3、tan(-7π/4)=tan(-π-3π/4)=tan(-3π/4)=-tan3π/4=1
4、sin900°=sin（720+180）°=sin180°=0
1、sin750°
=sin(360×2+30)°
=sin30°
=0.5
2、cos 22π/3
=cos(6π+4π/3)
=cos 4π/3
=-0.5
3、tan(-7π/4)
=tan(-2π+π/4)
=tan π/4
=1
4、sin900°
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1、sin750°
=sin(360×2+30)°
=sin30°
=0.5
2、cos 22π/3
=cos(6π+4π/3)
=cos 4π/3
=-0.5
3、tan(-7π/4)
=tan(-2π+π/4)
=tan π/4
=1
4、sin900°
=sin(360×2+180)°
=sin180°
=0
望采纳，谢谢！
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sin750度＝sin30度＝1/2.
cos22派/3=cos2派/3=--cos派/3=--1/2.
tan(--7派/4)=tan(派/4)=1.
sin900度＝sin180度＝0.
1 =sin(π/6)=1/2
2 =cos(π+π/3)= -cos(π/3)= -1/2
3 = -tan(π+3π/4)= -tan(3π/4)=tan(π/4)=1
4 =sin(5π)=sin(π)=0